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Home >> Chevrolet >> 2009 >> HHR SS, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 2.2L Or 2.4L - Troubleshooting & Diagnosis) >> Fuel Composition Diagnosis >> Circuit/System Verification

Circuit/System Verification

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  1. Observe the Fuel Composition Learn parameter using the scan tool. The Fuel Composition Learn parameter should display Inactive.
      IMPORTANT:
      • The key needs to be turned OFF for at least 30 seconds after the parameter displays Inactive to properly store the ethanol learned value in the ECM/PCM memory.
      • The vehicle may need to be driven more than 11 km (7 mi) with the engine at operating temperature.
    • If the Fuel Composition Learn parameter displays Active, drive the vehicle until the Fuel Composition Learn parameter displays Inactive.
  2. Record the ECM/PCM estimated value of the ethanol content using a scan tool.
  3. Record the actual measured percentage of ethanol content using the J 44175:  Tester or J 44175-A:  Tester. The ECM/PCM estimated value should be within 15 percent of the ethanol content measured with the J 44175:  Tester.
    • If the ECM/PCM estimated value is not within 15 percent of the ethanol content measured with the J44175 Tester continue with Circuit/System Testing.
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